A LATTICE MODEL FOR SEGMENTAL ORIENTATION IN DEFORMED POLYMERIC NETWORKS .2. EFFECT OF CHAIN STIFFNESS AND THERMOTROPIC INTERACTIONS

被引:28
作者
BAHAR, I
ERMAN, B
KLOCZKOWSKI, A
MARK, JE
机构
[1] BOGAZICI UNIV,SCH ENGN,ISTANBUL 80815,TURKEY
[2] UNIV CINCINNATI,POLYMER RES CTR,CINCINNATI,OH 45221
[3] UNIV CINCINNATI,DEPT CHEM,CINCINNATI,OH 45221
关键词
D O I
10.1021/ma00228a006
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The lattice model of segmental orientation developed in the preceding paper for athermal network chains subject to uniaxial deformation is extended in the present work to the case of (i) Kuhn segments with increased stiffness characterized by a relatively large length-to-width ratio, x, and (ii) thermotropic systems with anisotropic polarizabilities. Those two factors, of entropic and energetic character, respectively, contribute both to a first-order transition from a relatively disordered to a highly oriented structure, upon imposition of an external perturbation. This transition is observed from the abrupt rise in the orientation function accompanying the stretch under well-defined molecular characteristics and environmental conditions.
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页码:5341 / 5346
页数:6
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